All You Need to Know About Downpipes
#228
Quick question, I am prepping to swap my stock downpipe for a TurboXS catted downpipe and wanted to know if the o2 sensor wire reach or if I need to buy on o2 wire extender. I don't think I do but wanted to confirm before I started this small project.
#232
I'm comparing the ZZP downpipes currently. Which one do you guys think would be best? Is a catless downpipe better flowing than a catted one? Any HP gain differences with or without a cat?
Catless
400 cell cat
catless w/ 02 bung
catless w/ angled 02 bung
SOO MANY CHOICES?!?!
Catless
400 cell cat
catless w/ 02 bung
catless w/ angled 02 bung
SOO MANY CHOICES?!?!
#233
Senior Member
I'm comparing the ZZP downpipes currently. Which one do you guys think would be best? Is a catless downpipe better flowing than a catted one? Any HP gain differences with or without a cat?
Catless
400 cell cat
catless w/ 02 bung
catless w/ angled 02 bung
SOO MANY CHOICES?!?!
Catless
400 cell cat
catless w/ 02 bung
catless w/ angled 02 bung
SOO MANY CHOICES?!?!
#234
I'm comparing the ZZP downpipes currently. Which one do you guys think would be best? Is a catless downpipe better flowing than a catted one? Any HP gain differences with or without a cat?
Catless
400 cell cat
catless w/ 02 bung
catless w/ angled 02 bung
SOO MANY CHOICES?!?!
Catless
400 cell cat
catless w/ 02 bung
catless w/ angled 02 bung
SOO MANY CHOICES?!?!
#235
ZZP is 3". is that same as stock?
#236
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#237
Yeah I am debating on catted DP and a catback. I just don't want the car to drone while im commuting everyday.
#238
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#239
Senior Member
Get the downpipe before a cat back. It's great for daily driving. Almost stock quiet until you get on it. Cold start/ cat warm up drones for a minute but goes away.
Personally I'd get a catted dp if I did it again. Catless throws off my class in SCCA autocross.
Personally I'd get a catted dp if I did it again. Catless throws off my class in SCCA autocross.
#242
I might just leave the cat in, less gas smell and less sound. If I wanna go ballztothewall I'll get one without a cat haha
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cluelessk (09-09-2016)
#243
It's closer to 3", if not 3". The restriction is it has two cats and a dimple at the o2 sensor.
Even the stock SS/SC downpipe is 2.75". That's why it boggles my mind when people put a 2.5" downpipe on them.
#245
Seems like this is an ok thread to ask this.... since LHU and LNF are so close....
So over on the Regal Forums, the guys think the second cat (the unmonitored one), is the primary cat, and the monitored cat in the o2 housing (1st cat) is just a "light off" cat. I'm dying to correct them, but I just wanted to make sure I'm right that the unmonitored cat (2nd cat) is only there for clean up duty and most likely strict California emissions. Makes no sense that the primary cat wouldn't have o2 sensors monitoring it.
So over on the Regal Forums, the guys think the second cat (the unmonitored one), is the primary cat, and the monitored cat in the o2 housing (1st cat) is just a "light off" cat. I'm dying to correct them, but I just wanted to make sure I'm right that the unmonitored cat (2nd cat) is only there for clean up duty and most likely strict California emissions. Makes no sense that the primary cat wouldn't have o2 sensors monitoring it.
#246
Senior Member
iTrader: (6)
Seems like this is an ok thread to ask this.... since LHU and LNF are so close....
So over on the Regal Forums, the guys think the second cat (the unmonitored one), is the primary cat, and the monitored cat in the o2 housing (1st cat) is just a "light off" cat. I'm dying to correct them, but I just wanted to make sure I'm right that the unmonitored cat (2nd cat) is only there for clean up duty and most likely strict California emissions. Makes no sense that the primary cat wouldn't have o2 sensors monitoring it.
So over on the Regal Forums, the guys think the second cat (the unmonitored one), is the primary cat, and the monitored cat in the o2 housing (1st cat) is just a "light off" cat. I'm dying to correct them, but I just wanted to make sure I'm right that the unmonitored cat (2nd cat) is only there for clean up duty and most likely strict California emissions. Makes no sense that the primary cat wouldn't have o2 sensors monitoring it.
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Staged07SS (09-14-2016)
#247
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Catless downpipe
Question, if I get a catless downpipe I know I'll shoot the check engine light. But if I keep my stock downpipe and put it back for emissions come testing time. Will it remove the check engine light? The price for carted dp is so much lol
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